Tuesday, October 16, 2007

Most countries post signage, known as traffic signs or road signs, at the side of roads to impart information to road users. Since language differences can create barriers to understanding, international signs using symbols in place of words have been developed in Europe and adopted in most countries and areas of the world.Traffic sign - Wikipedia, the free encyclopedia

Red is any of a number of similar colors evoked by light consisting predominantly of the longest wavelengths of light discernible by the human eye, in the wavelength range of roughly 625–750 nm. Longer wavelengths than this are called infrared, or below red and cannot be seen by human eyes.Red - Wikipedia, the free encyclopedia